Particularly designed for cameras with a polarising half mirror (split beam metering) and Digital cameras. This Cokin polarising filter increases the colour saturation of blue skies and removes the unwanted reflections. Use an angle of 45 degrees from the subject and turn the filter in the holder to adjust the polarising effect. All Z-Pro filters are manufactured from high quality CR39 organic glass and fit the Cokin Z-PRO holder system. Diminishes or eliminates reflections, intensifies colours (especially a blue sky). Loses between 1-3 stops of light depending on rotation point. For autofocus or manual focus cameras.